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apply_cl: simpler

--- a/flisp.c

+++ b/flisp.c

@@ -876,7 +876,8 @@

 	USED(n);

 	USED(v);

 apply_cl_top:

-	func = FL(stack)[FL(sp)-nargs-1];

+	bp = FL(sp)-nargs;

+	func = FL(stack)[bp-1];

 	ip = cvalue_data(fn_bcode(func));

 	assert(!ismanaged((uintptr_t)ip));

 	i = FL(sp)+GET_INT32(ip);

@@ -884,7 +885,6 @@

 		grow_stack();

 	ip += 4;

-	bp = FL(sp)-nargs;

 	PUSH(fn_env(func));

 	PUSH(FL(curr_frame));

 	PUSH(nargs);

@@ -1086,10 +1086,10 @@

 					}

 				}

 			}else if(__likely(iscbuiltin(func))){

-				s = FL(sp);

-				v = (((builtin_t*)ptr(func))[3])(&FL(stack)[FL(sp)-n], n);

-				FL(sp) = s-n;

-				FL(stack)[FL(sp)-1] = v;

+				s = FL(sp) - n;

+				v = (((builtin_t*)ptr(func))[3])(&FL(stack)[s], n);

+				FL(sp) = s;

+				FL(stack)[s-1] = v;

 				NEXT_OP;

 			}

 			type_error("function", func);